HANOI (Reuters) – Vietnam has so far this year culled 137,180 birds to contain the spreading of bird flu outbreaks, the government said on Thursday.

The outbreaks, including 38 outbreaks of H5N6 and five outbreaks of H5N1, have been detected in 13 out of Vietnam’s 63 provinces this year, the government said in a statement.

All of the bird flu outbreaks have happened at farms where the birds have not been vaccinated, it said, adding that, in several provinces, only 10%-20% of the birds were vaccinated.

Vietnam has a poultry flock of 460 million, and small-sized bird flu outbreaks have not been uncommon in the country during the past five years.

(Reporting by Khanh Vu; editing by David Evans)